.d1 {
  background-color: antiquewhite;
  border: solid;
  width: 200px;
  height: 200px;

  transition-property: all;
  transition-duration: 200ms;
  // transition-property: width, height;
  // transition-duration: 200ms, 500ms;

  &:hover {
    width: 300px;
    height: 300px;
  }
}
